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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0d8483493ec210f456d24f22489f3259d67ca0f0d285ba616f8c06b0ace33f' 
  AND token = 'fswNER3qHyX5ZMJn1X01WgVBR5revxLC3gCmpt3HuBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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