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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc606490151cc0957565d227d97d89d7376c4486f37ee2d1e0596352a8943fa' 
  AND token = 'dI2YkQ85TOTiegWCnZz4g8SY4sOhslxarOwhbYZOedI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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