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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d5bc064fe0b3095ce5db2d595dbc6d57b9e0e8209ef814eb31c96a07d13447' 
  AND token = '5EZsbp34rreRJ33lCUcb2zwvZ1UtrcGJqmTOUXkwQ0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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