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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1d03f907ec7f560909672cde6f1fa9fa93420aec9ab9cb5215a26337135662' 
  AND token = 'P8fOO76HX/DEk+iXIn3cJRJwafntpk3GlxHA1QRCBd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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