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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81fbaad4f804d88a3780c8a0519ac9d05e3283dfdb3458b19950db24ef7c6d99' 
  AND token = 'goTcY8uzq5iLSLk8fqZ04D3Ypu45UEpuV+G34grxC+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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