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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae6e7fc1a6830667aa042306c0ae0f0c59ff60a515efc2135c07d77c92457b1b' 
  AND token = 'Qelh9iajBP+Z4nJFLlNXYMMzmsQIfqi8o4Q4ZR6SDmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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