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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0924a8a2a36b27a0f799fa1210690d3d14391ba89c28adc344dbb23308e1462' 
  AND token = 'I1V6rze7M8xNSsjywvEaRDLanWU2ezXYmvzGdnjMwOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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