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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a0460392b7d8c6afe2621c3120490d49e9db867bd9893af15352dd1534466a' 
  AND token = 'y1N8lWftGETSApX5yJvITnNR3BwusF3R0jpfPfAQ6nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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