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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c112b89451eba2501d17136f079b99734c4a85af9b6eba7e3a7831cd2353e403' 
  AND token = '+BnRdRnWXbJrfwgoQGsj/0jihC7Ue3i9rbNW4BH8EA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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