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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f6f2951a51411153af8469a4905e44506bc148c8e8ef88e04f61c5b340b83d' 
  AND token = 'xdC02y2AerFlUvA30rkNdQVFpQB6dME4BJVSKNqqJj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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