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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7e2e3399412ac40c41b3488a7ae3946dff910895724ff23fc89c6ceb654672' 
  AND token = 'jjxY/s9RDTMdk2fS6XN/JglV83Fmjw4XGSNkWE84Y4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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