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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3e6bc82fc85041a50e49c1c0ca2e259a24a67923f19f7577e6f6285e426562' 
  AND token = 'fEyFKZh62qYFAoacHz/ljuxj2LBPxEEQOM0RNSWsR98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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