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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954459e6ab95c54daa7c07dd31a567d4f8ed67c0cc99345dcc5a1d16d753141b' 
  AND token = '4AYIezeMJlIKsp6ArDIKbTFN+dE/LwisR0ThlbxXSjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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