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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13797d8748a260a3e7e70201585ac5e57f86fbb50a3d979f777b9e8824bb6d6' 
  AND token = 'Y3xfOJOL6VIcL27PaGn2rOvzWX0ilSCCL47/fiP4iHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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