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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff41bc27dff348e21baa69724cd70bc95327855c6a7d5839ffb6dca5ba883ea' 
  AND token = 'SPHdzEPttIF+19glYdZuDCROMwnx2sA/R2Zo9ikqP2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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