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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb69369a9b1c853b643801070159ce64dae25f29eb552930852e7306a608ed9' 
  AND token = 'D1/8K/893ebNuU89c+r37it6q9uWrDRO0Usi0IqekLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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