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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c8e47323df56867333d0162aff8c6e7a061c7dd11855a82f81f4dc1f31af00' 
  AND token = 'mmveyLVLBEbwsMsa5LYjDYtZujriv9pJaQvMYKUrruA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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