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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88a833a8636c71917d84423edcf613885385f73681e1f20b2ac0c3d281925c1' 
  AND token = '3ySteSvNgI31dGGAUd16nn5vXybm53d/Eps4hViJ8o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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