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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94fc7e5e6ffce52e429b0c455c8fe51eff4280208707c72e2d974b9fcc42f9e9' 
  AND token = '43JSC5plFHJvncjQoZbITU+MWbxRhPTxDV/MTvfwDik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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