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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07cc7e30e28d332f7f33a27136df9b91fe8c595c9bedb3f67fe05c0254078c8e' 
  AND token = 'K7GFUv/gqg9fZCjB7/C7Nqrj0AXleYZFB7nGvoiLs9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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