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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '806a590b0db71375f0fcee38782c6a8fa8d77593260e277fc20e29a6f7d9d9c4' 
  AND token = 'mcJC9xCPrGJTy87mvDh8ccNuqKnhfdTbPWfSG7OKTpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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