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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e892f1cb084ba2e61a8538a23158b766d357ae883f2f18f075674ce7fafc723' 
  AND token = 'WU6oHz2oXLPl7Wk7BUkGX54a92LLkvhRCVJ8Run6ZVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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