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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ea8b13b11a95cf76ff6724a30298543f142aaafc0f137d0560a4bc45e717a0f' 
  AND token = 'gX+9uJ3DcIVrfzdaXft81pgz11S8ompKig/ja/KInek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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