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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47457dee1af1ccd21bb70022435666e4426319ca6dd3d217b3a528769b148522' 
  AND token = 'Rlw8cbwkRy+7nTD6vpFxRRG2b2E7ZyO1G68RcAK7YX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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