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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65f2cbac9180a88f6e7be8ced3b32048857f568323459fd06a73d086f966bb7' 
  AND token = 'kXwaczv5bsHnvVjK5ccOx+mWVEmI89ijuwbqadCZznE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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