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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ccdbdbb0d16e188a72dac9d62fe27895771e403eead03e72a9c6e3a65d1c061' 
  AND token = 'utkD3rEHB5E7PNP+L8y2ogugp16fXgDnlV7ZPJXoRtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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