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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d0f78bbdcc93ef394b8ea94fc81090db1164a5f201cda6c66bc8acb763a977' 
  AND token = 'KT2jkeb7l/0vOq/lq+gRGIE/0TO5SriQIevg2i+0+N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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