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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ede5e7e95156405d6d68ba15e429681ebdf0c73cc77e63450e08c10b7b57b7' 
  AND token = 'xnv6+yQljZWwToT8E8nBer0VTOC1qS2qk0+QDseeYaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}