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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc36f368ca15d0763d955a2c5eb657c493cd7cd25bb9f2975604f78a1e73dca' 
  AND token = 'sxk6+XM3Lwti7QM8raLg2N6ahUwtXzKqJFpKyfafRX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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