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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be8ad786b1197a92a19884f0188306473053f00dee38c0bd58ff6b8f687374c' 
  AND token = 'wATNJtfLqsc/Qn6kyp+1a2gVPr+xpqaKR36X44WXaWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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