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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d972219ba5a1d6909b4cfa55fcd4dcb701cb3f9660832e3e7f262ae5e78ef30' 
  AND token = 'epaNDPJu+NSxzWbyQ5zCccp6owX2gnHTnsMREegP4WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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