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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc33697a48018aabe83d3a7000f1d67350a63dc03d5c2cd1eeba7f952ad4f51' 
  AND token = 'MCnaRwjfoNk/qE67z40zS3g02jpV1SPIyca4kg8gHWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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