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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0bcca40b82550076d3aa2206d38355dc9c89fc28e8fd2e12e38b7a8f888f92d' 
  AND token = 'BZHEgK3uS3Tw6O8EFfMtI/koE+1RRKJtT8+9UiDDQSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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