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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c426bc8313a70e4f6a2bf12701efcbabf0963ee5dc0299ba4784bf754ba17311' 
  AND token = 'I8ERliBRJT41EFHcz0vOH7ZmafM7hVLdklsYIssGwuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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