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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac88e5e18b2c4ced4f94cf0a1a71d916b7dc544a475ba91b667f6d6023e616d' 
  AND token = 'H/aThpJJ1d41dtNqnmJuRcgWUNYPTkYKhVa7HtoWgYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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