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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ffd93e586725302453afd7ff48498f4a8d49db8b26bea3313fd596f431a6e5' 
  AND token = 'R6cONLIdey4z86h0u2HX9yqacWJwyRcHJgMhg8FAKlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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