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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a84f3e664b9df69963893b2347a2d43004fef4cf087ecdd6706e827dfd1d9e' 
  AND token = '8w+rinSNyHBJxUVVekJNlth9930oWjHMCos0l56wTLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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