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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1041ea00b87e5af939e340a44da171c1e6f06311ac3c8ce185f8a7243bf7af49' 
  AND token = 'fNCgM3Blm7FpZ2SEiTLBAgfj+3CNOSOfpRknhpffyE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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