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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bfbd686ce2e7c34ca4803df61b8b73220e114a509023524960be52fe32edc21' 
  AND token = 'p8cc8/vu1BpzoAp+hxrluz4jiPEmLzrOoPmWGRXXnIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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