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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba0aa5e743ceb032ee998735cbd6d73316a1bf9616492e923a066d2bdba8ebb' 
  AND token = 'Xgk+oidCQUipm6ohMSNmyvkudrSwdQfpDCVt4Z2kF3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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