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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb2b6f386f0a7346cf061da77725722e30db8b7022941da97b394cc56cc2651' 
  AND token = 'uM+OcZonCdIoN0ErHDHFnQC+Cdqxpla48d3YOKKEhmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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