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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9938389123c16683a0a9dd4e9ba9d4f15a9223a647f9cd56b68e2fb4b6faa45f' 
  AND token = 'NuWX0oMm6IfL15ONoa4Oz29A7C0bijLh14gRi8B0TcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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