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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4469589638e65e09e6ee5635f7caaf1a335c7b547b8da3ad23773372ab425622' 
  AND token = 'xr3Otkv3EDSn98RFLOkPzD1M1Gzjlk1K82+QC7t2W6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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