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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168ff08831b5c8c8b55c1dc709e9705092517ec33c0281d640a2b8a92c76188b' 
  AND token = '3MyJDkfflx2MLwQxhnCo2WFLgLAv1/HuaSRbAFhEe9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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