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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79139e0be2be3513959056c5baf4cce34e1812e4a80499f0c1fbb5b1c7183bb' 
  AND token = 'uC1guDKnDSXkDgWZF+DMrd1WwtMXd1NRacNBDyMnjYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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