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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41d4a1d2e3057ffff2c2e5cbc358d48d4aa7aa2a2a11c634e36a4473721e1fcf' 
  AND token = 'fYc3JpZ0PuBPHcTAZLlCL5ikqQEUWoOyZUSCENqAywc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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