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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269ed8b176364566e431a1058b79c3d1750c4a99e8b1a680475f58adddf28fe6' 
  AND token = '95fJayoiI+bds+ZVk95uuCiXYLEWcrCSOM5Qr1z13K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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