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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8208c30757a350e5bfd33e918759874eadfb25d0eecd52a67783cc787140c3d2' 
  AND token = '0OTloqY4eEILMuQwLkoqQ9AivJqiDsg46K2IRPB3E2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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