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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78d8c48f111d94d27d5e59890332ef88c7ea6d84a552c05d1890cb9096a5e2a9' 
  AND token = 'umGzVlLirjZdxnRh00xQez5Tsg6BbMlP8WDEpvA4Ork=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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