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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6711d0c5a4892f3c4a8873f64a4763477750aca1949ba6b56294e567f5cb3afa' 
  AND token = 'esfPdpqTHwywRW9xprKfQ99+A4SbEKMdikiJux0Jmj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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