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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c0b4308b8b7704f1aafe70c5d08facae37128628de1db99e48ee6214c3b1c92' 
  AND token = '6Ve3mwYtJzX6xOLFHHKNM2KWF3+2H6FGCu7cRgvC+DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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