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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e92163f023576720509a3fb32b8ace1f8b7a3382b61117a6fb7628a8c47b2cd' 
  AND token = 'W3yMyILam7stSKucN9GP5EwVmDKnqG/KoRgi2rwtPUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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